[qa] pull-tester: Only print output when failed

qa/pull-tester/rpc-tests.py

@@ -215,8 +215,8 @@ def runtests():
         time_sum += duration
 
         print('\n' + BOLD[1] + name + BOLD[0] + ":")
-        print(stdout)
+        print('' if passed else stdout + '\n', end='')
-        print('stderr:\n' if not stderr == '' else '', stderr)
+        print('' if stderr == '' else 'stderr:\n' + stderr + '\n', end='')
         results += "%s | %s | %s s\n" % (name.ljust(max_len_name), str(passed).ljust(6), duration)
         print("Pass: %s%s%s, Duration: %s s\n" % (BOLD[1], passed, BOLD[0], duration))
     results += BOLD[1] + "\n%s | %s | %s s (accumulated)" % ("ALL".ljust(max_len_name), str(all_passed).ljust(6), time_sum) + BOLD[0]